Improvement in screw-wrenches



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UNITED STATES PATENT OFFICE.

JOEL C. JACKSON, OF ROCHESTER, NEW YORK.

IMPROVEMENT IN SCREW-WRENCHES.

Specification forming part of Letters Patent No. 55,109, dated May 29,1866.

To all whom it may concern:

Be it known that I, JOEL (l. JACKSON, of Rochester, in the count-y ofMonroe and State of New York, have invented, made, and applied to use acertain new and useful Improvement in Wrenches; and I do hereby declarethel following to be a full, clear, and exact description of my saidinvention, reference being had to the annexed drawings, making part ofthis specification, wherein- Figure 1 is-an elevation of my improvedwrench. Fig. 2 is a vertical longitudinal section; and Fig. 3 `is a Viewof the nut and rack, the handle being removed.

Similar marks of reference denote the same parts.

My invention consists in a screw-nut surrounding the stationary bar ofthe wrench and actin g upon a sectional screw-rack that extends from themoving jaw in a groove in said stationary bar, and these parts arecombined with a metallic socket at the end of the handle, against theface of which the side of the said nut revolves.

In the drawings, a .is the stationary jaw at the end of the bar b, whichis prismatic and forms the slide for the moving jaw c, and this jaw c isextended toward the handle d in the form of Va bracket, c', and behindthis bracket c', and extending down to the handle, is a sectionalscrew-rack, e, which occupies a recess or groove in the bar b. The bar bis extended through the handle d and secured by a nut,f, and g is ascrew-nut the thread of which takes the threads of the sectionalscrew-rack c. The

bar b, near the junction thereof with the handle, is rounded, as seen inFig.- 3, so that the nut g may freely turn thereon, and both saidrounded portion of b and the rack e passing through said nut, theinterior ofthe nut is so lled that the threads on the nut are keptproperly in contact with the threads of the rack.

' Atv the end of the handle d next the nut g is a metallic socket, h,having an opening at the end for passing the bar b, and anotch adjoiningsaid opening for the rack c, so that the same may pass into the handlewhen the jaws ofthe wrench are open, and the end of this socket h takesthe side of the nut g to support the same.

It will be evident that my improved wrench is very simple, strong,easily constructed,'has but few part-s, the screw-rack is protected frominjury, and there is very little liability for the parts to becomeobstructed or to wear out in use.

What I claim, and desire to secure by Letters Patent, is-

The sectional screw-rack extending from the bracket cl of the moving jawc, and occupying a groove in the bar b, in combination with the nntg,surrounding said bar b contiguous to the socket 7b, substantially as setforth.

In witness whereof I have hereunto set my signature this 31st day ofMarch, A. D. 1866.

J. C. JACKSON.

Witnesses:

GEO. B. SMITH, I. B. DEWEY.

